The Reese Towpower Professional Universal Coupler Lock has a unique patent pending design that protects against trailer theft and a square key design that resists picking. This lock is constructed of cast steel material and a premium corrosion resistant finish, fits 1-7/8 inch, 2 inch & 2-5/16 inch couplers and multiple coupler styles with it's easy slide installation. REESE is the market leader in automotive and recreational product solutions, engineered and designed to meet the demands for work and active lifestyles. REESE Towpower pioneered the technology that has set the standard for today's most advanced towing systems. We cater to the towing needs of everyone from recreation enthusiasts to heavy-duty agriculture users by manufacturing the largest selection of receiver hitches; ball mounts and hitch balls; trailer and hitch locks; couplers, jacks and winches; and electrical and lighting components that meet and exceed industry standards.